st: Update fsum program

Thanks to Kit Baum, an updated version (v 2.2.0)of -fsum- is now available.

The major changes to -fsum- have been to display the "sum" of "percent"
variables; to default the format of the sum to %n.0f, with an option to use
decimal format if desired; and to use Stata 8.2 code, making it faster.

The package does not include the tlabel utilities that were in the 2002
release of the package, as I found I never used them. Instead, I used a
-mktlabel.ado program and modify it as needed.

With a text editor macro, entry of "capture char [tlabel] " is simple. The
mktlabel program works in the same way as a list of var labels except that
they are char labels.

fsum is a general purpose summary statistic program. Its display can be
formatted with appropriate labels and variable formats so that its output
can be pasted into a word processor without the need for further
alterations within the word processor.